Now it's '95 and they clock me and watch me
The year is 1995 (10 years later, as referenced above).
“Clock” = to gauge.
He’s saying now that he’s been around for a decade and succeeded, everyone checks him out and sees all the benefits of his hard work.
To help improve the meaning of these lyrics, visit “California Love” by 2Pac (Ft. Dr. Dre & Roger Troutman) Lyrics and leave a comment on the lyrics box